Windows XP service pack 3 out next week
According to Chris Keroack, the release manager, service pack 3 for Windows XP will be available for download (Windows Update and the Microsoft Download Centre) on April 29th, 2008.
Versions for MSDN/TechNet, Windows XP Embedded and Windows Fundamentals will arrive at a later date.
Looking through the KnowledgeBase, the only public fix for MSMQ customers that will be included in SP3 is from one of my support cases {{Warm glow of pride}} :
although it's not a hotfix for MSMQ code.
The full list of hotfixes is not published yet but when it is this link should start working: